I have a dictinary with key values in python. I want to loop through to see if a specific value exsists in the dictinary. if the value exsists than i want to add the key to a array and the value to another array. how do i retrive that key? im also having trouble adding getting the key to add

dic {"mark": "twain", "john": "doe", "steven": "shark"}

firstName= [] lastName= []

fName = input ("enter a first name")

#loop through every key value in the array

for item in dic:

if fName in dic:

firstName.append(dic[fName ])

lastName.append(dic.keys())

i want to add the first name to to firstName array and the last name to the lastName array. and to loop through the whole dictinary